Method and apparatus for collecting, processing and displaying audience-response data. Audience-response data is electronically collected then processed by a computer for storage and display with corresponding time markers. One or more time markers can be selected for display of corresponding audience-responses...http://www.google.com.hk/patents/US20020094513?utm_source=gb-gplus-share專利 US20020094513 - Method and apparatus for collecting, processing and displaying audience-response data
